Rotating camera mount



July 18, 1950 A G. NASH ROTATING CAMERA MOUNT 4 Sheets-Sheet 1 Original Filed April 22, 1945 INVENTOR Nash hzvs A. G. NASH ROTATING CAMERA. MOUNT Original Filed April '22, 1945 Jul 18, 1950 4 Sheets-Sheet 2 INVENTOR 'lmlllilllllllllllllll Ama- A'Tizz EYS y 18, 0 A. G; NASH p, 2,516,068

- ROTATING CAMERA MOUNT OTiginal Filed April 22, 1943 T v 4 Sheets-Sheet 5 INVENTOR Alfred Nash ATTORNEYS July 18, 1950 v A. G. NASH ROTATING CAMERA mouu'r 4 Sheets-:Shet 4 Original Filed April 22, 1943 Patented July 18, 1950 ROTATING CAMERA MOUNT Alfred G. Nash, Richmond Hill, N. Y., assignor to Fairchild Camera and Instrument Corporation, Jamaica, N. Y., a corporation of Delaware Original application April 22, 1943, Serial No. 484,088. Divided and this application October 4, 1946, Serial No. 701,190

Claims.

This invention relates in general to photographic apparatus, and more particularly to a mount adapted to be attached to an airplane for rotatably supporting an aerial camera. This application is a division of my co-pending application, Serial #484,088, filed April 22, 1943, which issued on February 11, 1947, as United States Letters Patent 2,415,563.

It is often desirable in military reconnaissance Work, as well as in other types of aerial mapping, to photograph terrain or specific subjects While the airplane is traveling at a relatively high speed and at a relatively low altitude, i11ustratively'250 miles per hour at 300 feet above the terrain or object being photographed. Under such conditions, particularly in military reconnaissance, it is desirable to employ small high speed aircraft capable of evasive action of which heavy bombers or large observation planes are incapable.

Aerial photography, under such conditions accordingly necessitates equipment different from that customarily used, particularly in the instance of the shutter which must be of anextremely high speed design, and the camera should be so mounted on the airplane'that its optical axis can be displaced asdesired sothat the pilot of theairplane can operate the camera from a position remote from its mounting. Of course a mount capable'or attaining these ends must beof simple and rugged construction so as to make certain reliable operation underextremely adverse conditions, in order to assure successful completion of the particular mission.

It is accordingly among the objects of this invention to provide a mount for rotatably supporting and controlling anaerial camera which can attain the above ends, in addition to many others, in a thoroughly practical and eflicient manner. Other objects will be in part apparent and in part pointed out hereinafter;

The invention accordinglyconsists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described, and the scope of theapplica'tion of which will be indicated in the following claims.

In the drawing, wherein Ihave shown one form of my invention:

Figure 1 is a perspective view of-my mount-with the camera supported therein, thi View also showing the remote control panel by which the camera is positioned;

Figure 1A is a diagrammatic viewof the camera mount and control panel installed in an airplane; Figure 2 is a side elevation with certain portions broken away and other portions shown in section, showing the mount with the camera supported therein;

Figure 3 is an enlarged perspective view of the camera mount, the cover being removed and portions broken away to show more clearly various structural features of the mount;

Figure 4 is a wiring diagram for the camera mount; and, Figure 5 is a wiring diagram of the camera itself.

Similar reference characters refer to similar parts throughout the various views of the drawing. Referring first to Figure 1, the camera, mount is generally indicated at I0 and has mounted therein a camera generally indicated at I l, which may be of any suitable type, but prefer-ably has a shutter capable of high speed operation. The camera mount I0 is preferably so arranged that camera I l is held in a position approximately 18 oif its vertical axis, so that the field of view intereepted by a prism or mirror attachment on the end of the camera cone (described hereinbelow) extends from the horizon downwardly about36" (see Figure 2). As will be described, camera H can be rotated in a, horizontal plane through a complete circle and can be stopped and operated at any one of a plurality of settings. This operation can be effected by manipulation'of a control panel or box generally indicated at l2 (Figure 1) located at a remote position from the mount as, for example, in the cockpit of the airplane con venient to the pilot so that the pilot can take oblique'pictures fore, aft or to either side of his line of flight. Furthermore, the operator can change the camera, from one setting to another with sufficient rapidity to photograph the same object from the rear that was taken in front, while traveling at a-substantial speed at a relatively 10W altitude.

Mount Ill includes a base l3 which supports the various operating mechanisms and, as is shown in Figure 2, is provided with an enlarged opening it through which the cone l5 of camera ll extends when the camera is secured tcthe mount. Base |3 is provided with a suitable number of holes I6 (Figure 3) provided to receive bolts (not shown) or other devices for securing the camera mount to the airplane (not shown).

At regularly spaced points about opening M in base 3 (Figure 2) I provide supportin rollers, such as roller rotatably mounted, preferably by an anti-friction bearing, on a stud I8 which extends upwardly through base l3 and through the roller. The roller is held on the stud and the stud is held in the base by a nut l9 threaded on the upper end of the stud. There are preferably four of these rollers I! provided, three of which may be seen in Figure 3. These rollers I! are so dimensioned as to extend inwardly of the edge of opening |4 (Figure 2) and into a channel formed in the bottom of a camera retaining ring generally indicated at 2| (see also Figures 1 and 3). Ring 2| is formed to clear the camera through its center in such a manner that the camera cone I5 is directed downwardly through opening M in base l3 so that the optical axis of the camera is inclined from the vertical, preferably by an amount on the order of 18. To this end, ring 2| includes a circular wall 22 having a relatively low portion 22a and a higher portion 22b. Wall portion 2211 has integrally formed therewith an upstanding inclined bracket 23 (Figure 2) through which is threaded a padded clamping screw 24 which serves as a steady rest for the camera at a position diagrammatically opposite portion 22b of ring wall 22. This portion 222) of the ring wall is preferably flat, as shown in Figure 3, and has formed therein a number of holes 25 to receive screws 26 (Figure 2) adapted to :be threadably received in the upper portion of camera cone 5, thus to secure camera H in proper position within ring 2|. It may now be seen that camera supporting ring 2| supports camera II in the desired position and is rotatably supported on base l3 of the mount by rollers H to enable rotation of the camera about the axis of the ring.

To the lower portion of camera cone l5 (Fi ure 2) is attached a suitable bracket or clamp 21 from which extends'an angled support 28 in which a mirror 29, for example, may be detachably held, as by a clamp 30 fastened to support 28 by a screw 3|. Support 28 is preferably held rigid in its angular position by a pair of oppositely disposed side walls, such as side wall 32, extending downwardly from the side of clamp 21 to the edge of support 28. Support 28, and accordingly the plane of mirror 29, is preferably disposedat such an angle that the field of view intercepted by the mirror extends from the horizon downwardly. by an amount on the order of 36",, thus enabling the pilot to take pictures oblique from the position of the camera in the air- Plane.,."

As shown in.Figure-3, supporting ring 2| has integrally formed therewith an annular boss in which arecut gear teeth 33. These teeth 33 (as shown in Figure. 2) thu s comprise an annular gear disposed immediately above groove 26, and accordingly are in a position to mesh with an idler pinion 34 rotatably mounted preferably by an anti-friction bearing (not shown) on a stud shaft 35 extending upwardly through and suitably secured in a plate or platform 36. Plate 36' is detachablysecured to base |3 (Figure 3) as by screws 31, so that the plate, together with the variouswdevices secured thereto, may be installed on or detached from the mount base as a unit. Pinion 34 (Figure 2 meshes with a spur gear 33 4 rotatably mounted on a stud shaft 39, also secured to and extending upwardly from plate 36. This stud shaft also rotatably supports a gear 40 which is attached in any suitable manner to spur gear 38 so that both gears rotate together. The upper end of shaft 39 (Figure 3) is supported in the top of a U-shaped bracket 4|, the feet of which are secured to plate 36 as by screws 42, the bracket thus surrounding gears 40 and 38 and providing ample support for shaft 39.

Large gear '40 (Figure 3) meshes with a worm gear 43 fastened to or formed on a shaft 44, the opposite ends of which are attached as by suitable flexible couplings 44a and 4412, respectively, to the armature shafts 45 and 46 of a pair of motors 47 and 48. Thus, it will appear that these motors are connected in tandem and together drive the train of gears comprising worm 43, gears 46 and 38 (Figure 2) idler 34 and ring gear 33, thus to rotate ring 2| and accordingly camera M. It should also be noted that this train of gears constitutes a substantial reduction so as to permit the use of small high speed motors 4'! and 48. Of course, if desired, a single motor only may be used.

.It will now appear that when motors 41 and 48 are energized they together drive shaft 44, and accordingly ring 2| through the reduction gear train described, so as to rotate the camera about the axis of ring 2| into any of several positions as desired, all as will be described in greater detail. Also, as will be described, it is desirable that the pilot be able to position the camera at any one of several predetermined stations; to preclude the camera coasting beyond the selected station, I preferably provide a magnetic brake generally indicated at 49 in Figure 3. This brake may be of any suitable type, and accordingly may comprise a braking unit 50 adapted to clamp the armature shaft 46 of motor 48 when solenoid 5| of the brake is deenergized, thus precluding both of motors 41 and 48, and accordingly the camera, from coasting.

Still referring to Figure 3, I have provided a set of illustratively four contacting strips, 52a, 52b, 52c, and 52d attached to an insulating block 53 which is fastened to retaining ring 2| as by screws 54. These strips are fastened to block 53 as by rivets 55 so that the outer strips may be connected by a conductor 56. The rivets which secure the two inner strips to block 53 are electrically connected as by conductors 51 and 58 to metallic contacts 59 and 60, respectively, which contacts are in turn electrically connected to the control circuit of the camera, as will appear from the following description of the wiring diagrams shown in Figures 4 and 5.

Illustratively, four contact plates, 6|, 62, 63, and 64 are disposed in quadrature about camera retaining ring 2|. These plates are formed of suitable insulating material, and each is secured, as for example plate 6|, to a pair of posts 65 extending upwardly from and in turn secured to base 3 of the camera mount. Each of these plates carries the same number of contacting buttons as the contacting strips 52. Thus, plate 6| is provided with buttons 6|a, 6|b, 6|c, and (H11, plate 62 with buttons 62a, 62b, 62c, and 62d, plate 63 with buttons 63a, 63b, 63c, and 63d, and plate 64 with buttons 64a, 64b, 64c, and 64d. Thus, there are on each of these contact plates a set of buttons positioned to engage the contacting strips attached to plate 53 when ring 2| is rotated through the several stations. As will be described hereinafter, the rotation of ring 2| is automatically controlled so that when one of the contact plates Bl64 is'selected, the ring automatically stops so, as to position the contacting strips 52a--52d in engagement with the contact buttons on the selected plate, as for example plate 6I in Figure 3. At the time contact is made between the strips and buttons, ring 2| not only immediately stops'rotation by reason of the action of magnetic brake 49, but also a circuit is completed to the circuit in camera H (Figure 1) which automatically effects operation thereof.

With reference to Figure 3,a normally closed relay, generally indicated at 66, is secured to mount base l3, and it is this relay which controls the operation of motors 41 and 48 when the control panel l2 (Figure l) is adjusted. Current is supplied to the mount circuit from the aircraft supply at a socket 61, while control panel I2 is connected to the mount circuit by a cable 68. As shownin Figure 1, the operating mechanism for the mount is preferably housed within a detachable cover 69, which isreadily removable for access to the mechanism.

The operation and control of my above-described mount can best be understood by reference to the wiring diagrams shown in Figures 4 and 5. As noted above, current is supplied to the mount from the aircraft supply by socket 611. To the terminals of this socket are connected main leads Ill and II across which motors 41 and 48 are connected by way of leads I2 and l3. i3 is connected to a movable contact M which coacts with a stationary contact connected by a lead 16 to lead 10. Thus, when contacts 14 and 75 are in engagement, motors 41 and 48 operate. Contact 14 is mounted on the armature 11 of relay 66, and as this relay is normally closed, contacts M and 15 are. normally out of engagement. Coil 5| of magnetic brake 49 is connected across leads H and-l3 by leads 18 and is so that when the circuit of motors 41 and 48 is closed to energize the motors, brake coil 5| is energized to retract brake element 50 from the armature shaft 46 of motor 48. When, however, the motor circuit is broken by reason of the separation of contacts 14 and ldcoil 5lof the magnetic brake is deenergized permitting brake spring 49a. to force brake 50 against shaft 65, thus preventing the motors and accordingly the camera mounting ring 5! (Figure 3) from coasting.

Referring back to Figure 3, the inside contact buttons E5ld6td are connected in series by a wire 80 which in turn is connected to lead .H from the current supply. The next to the inside contact buttons lilo-64c are'connected together by a wire 8| which is in turn connected by a lead 82 to a terminal C. Thenext to the outside set of contact buttons filb-Gb are connected.together by a wire 83 which is in turn connected by a lead 84 to a terminal G; Outsidebutton Bla is connected by a wire 85 to a terminal 1"; outside button 62a is connected by a wire 86 to a terminal E; outside button 63:]. is connected by a wire Bl to a terminal A, and outsidebutton 64a is connected by a wire 88 to a terminal D. This set of terminals also includes terminals '13 and H connected respectively to main lead 10 and a lead 89, the other end of lead .89 being connected to the coil 66!; of relay 66. The other end of this coil. is connec'tedby a lead Ml to main lead 10, and hence to one side' of socket 61.

Insulating block 53 is indicated diagrammatically in Figure-4,. and lthe contact arms carried thereby are indicated byfthe arrows Hit- 52d.

Lead

It may be seen that the inner and outer contact strips 52a are connected by wire 56 and thence to ground; the next to the outer strip 52b is connected by a lead 9| to a post B; the next to the inside strip 520 is connected by a lead 92 .to a post A. Posts A and B correspond to posts A and B shown in socket Q3 in Figure 5 and lead to various elements of the camera circuit, as will be described.

Thus post B of the camera circuit is connected by a lead 94 to a movable arm 95 carrying a contact 96 which is normally in engagement with a stationary contact 91 connected to a lead 98. Contacts 96 and 91 constitute an overrun control for the camera motors, and are automatically separated when the supply of film in the camera magazine has been exhausted, Inasmuch as the specific details of the camera circuit and its operation comprise no part of the present invention, it will suffice to point out that lead 98 is connected to one side of camera motors stand I00, the other sides of the motors being connect ed by a lead llll to ground. 'Post A of socket 93 is connected by a lead 502 to one side of a film wind indicator, generally indicated at Hi3, the other side of the indicator being connected by a lead Hi l to ground. This indicator is preferably driven directly by the film and is so constituted as to flash once for each cyclic operation of the camera, the indicator preferably being located in control box l2 where it is readily visible to the operator of the camera or the pilot of the airplane, as the case may be, so as to indicate to him the proper operation of the camera.

Terminals A-H (Figure 4) are connectable with a complementary set of terminals Al-Hl by cable 68. Terminals Fl, Al, E5, and Di are connected respectively by leads I95, I96, Hi7, and me to the several control positions of control panel I2 herein illustratively designated as fore, aft, right, and left, respectively.

Control panel [2 includes a selector switch Hi9 (see also Figure l) which is movable to any of the stations indicated, and this switch is connected by a lead ill to terminal HI. A camera signal light Hi is connected across terminals Cl and G! by leads H2 and H3, respectively, while an on-off switch l M is connected to terminal Bl by a lead M5, the other side of the switchbeing connected by a lead Ht to lead H3. Preferably, camera signal light ill and on-off switch H4 are located on control panel 62, as shown in Figure 1, so as to be readily visible and available to the pilot, or to whomever is operating the camera.

Thus, assuming that on-off switch H4 is turned to itson position, the operation of the control is as follows: When the selector switch or switch arm m9 (Figure 4) in the control panel I2 is manually rotated to a desired position such as, for example, the fore position, a circuit is closed to energize the driving motors M and 48, causing the mount ring 2! and accordingly insulating block 5; to rotate clockwise. This circuit is constituted as follows: socket 61, leads ll, 12, motors 4T, 48, lead 13, contacts 14 and 55, and leads l5 and 'lil back to the other side of socket 61. It should be noted, however, that this circuit is energized only when contacts 14 and '55 are closed, and these contacts are closed only when relay 66 is deenergized. This relay isenergized only when selector switch N39 is in one of the control panel positions indicated and when contact strips 52a52d are in engagement with one of the sets of contact buttons, for example,

set 6Ia-6I d. Thus, for example, when the contact strips are in engagement with that set of buttons, and selector switch I09 is at the fore position, the following circuit is completed: switch arm I09, lead H0, terminals HI and H, lead 89, relay 66, lead 90 and lead I to one side of socket 61; the other side of socket I6, lead 'II, wire 80, contact button 6Icl, contact strip 52d, conductor 56, contact strip 52a, contact button 6Ia, lead 85, terminals F and FI, lead I to the fore station, and thus back to selector arm I09. This circuit, however, is broken when switch arm I09 is moved from the "fore station and accordingly relay coil 66a is deenergized, permitting contacts I4 and I5 to close, thus to energize the motor circuit. The motors then operate to rotate mount ring ZI and accordingly contact strips 52a-52d to the position selected, and when the strips engage the contact buttons at the selected station, the circuit to relay coil 66a is reconstituted and motor control contacts I4 and I5 are separated, thus breaking the circuit to the operating motors 4! and 48. When these contacts separate, the circuit to magnetic brake 49 is also broken, permitting brake spring 49a to press brake shoe 50 against the armature shaft 46 thus immediately stopping motors 41 and 48 and accordingly preventing mount ring 2| from coasting beyond the desired position.

When contacts strips 52a52d engage with a set of contact buttons, for example buttons 6Ia6Id, the camera circuit shown in Figure 5 is connected to the current supply. This circuit is constituted as follows: socket 61, lead I0, terminals B, BI, lead H5, on-off switch H4, lead H6, lead H3, camera signal light III, lead H2, terminals CI and C, lead 82, contact button 520, wire 8|, button 6Ic, contact strip 520, lead 92, post A, film wind indicator I03 and lead I04 to ground, lead 56 (Figure 4) contact button 6! a1, wire 80 and lead II to the other side of socket 61, thus energizing the film wind indicator circuit. The energizing circuit for camera motors 99 and I 00 is constituted as follows: socket 61, lead I0, terminals B and BI, lead H5, "on-off switch H4, lead H6, lead H3, terminals GI and G, lead 84, wire 83, contact button BIb, contact strip 52!), lead 9|, post B, lead 94 (Figure 5), lead 95, contacts 96 and 91, lead 98, motors 99 and I00, lead If to ground, wire 56, contact strip 52d, contact button 6Id, wire 80 and lead II to the other side of supply socket 57.

Thus engagement between contact strips 520%- 52d with buttons 6Ia,6Id energizes the camera circuits which control the camera motors and the film Wind indicator. In this connection, it should be noted that film wind indicator I03 includes a cam I03a adapted to be rotated by the film in the camera magazine. Thus when the unexposed film is exhausted, the circuit through the film wind indicator is automatically broken and as the camera signal light I I I (Figure 4) is in this circuit, it cannot light, thus indicating to the operator or pilot either that the film is exhausted or is otherwise unavailable for exposure.

Furthermore, the outside contact buttons Bla- 64a and the inside buttons Bid-64d in conjunction respectively with contact strips 52a and 52d control the position of the camera.

It will thus be seen that the camera can be operated at will whenever the mount is stationed at one of the four positions, but that it will not operate, even when switch H4 (Figure 4) is on, while the mount is rotating (except when it passes over a set of contact buttons on its way around to the selected set). If desired, a solenoid operated counter or the like (not shown) may be substituted for magazine signal light I II in order to provide the operator with an actual record of the number of exposures taken or remaining in the camera.

Thus I have provided'a camera mount which attains the several objects hereinabove set forth in a thoroughly practical and efiicient manner.

As many possible embodiments may be made of the above invention, and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. Photographic apparatus comprising, in combination, a mount, a tubular camera support, means rotatably securing said support on said mount, a camera attached to and extending through said support, means for rotating said support and said camera relative to said mount, and remote control means for stopping rotation of said support at a predetermined position.

2. Photographic apparatus comprising, in combination, a mount having a circular opening extendin therethrough, a camera support rotatably secured on said mount and having a circular opening extending therethrough with a tubular extension coextensive with said opening and extending therefrom, a camera secured to said tubular extension and extending through said opening, an electric motor secured to said mount for rotating said support, stopping means for deenergizing said motor, means spaced peripherally around said mount for actuating said stopping means, and means responsive to actuation of said stopping means for applying braking force to said support. I

3. In photographic apparatus, the combination of, a rotatable support having a longitudinal opening therethrough, a camera mounted on and within said opening of said support with the optical axis thereof extending through said opening, a motor for rotating said support, control means remotely located in respect to said camera and supports, means forming an operative connection between said control means and said motor, said control means being operable to effect energization of said motor to cause rotation of said support, and means associated with said connection means and said support for automatically stopping rotation of said support at any one of a plurality of predetermined positions in accordance with a selected adjustment Of said control means.

4. In photographic apparatus, the combination of, a base having a hole formed therein, a ring member rotatably mounted on said base above said hole, said ring member having peripheral gear teeth thereon and adapted to support a camera so that the camera extends through said ring and through said hole in the base, a motor secured to said base, and reduction gearing connecting said motor and said ring whereby operation of said motor rotate said ring and accordingly said camera.

5. Photographic apparatus comprising, in combination, a mount adapted to be installed in a fixed position and having a circular opening formed therein, a camera support adapted to be rotatably carried by said mount and including a tubular section the axis of which isinclined with REFERENCES CITED The following references are of record in the file of this patent:

Number Number 10 UNITED STATES PATENT Name Date Snowden July 31, 1923 Eliel Nov. 12, 1929 Howell Feb. 21, 1933 Richards Apr. 24, 1934 Wills et al Jan. 29, 1946 Nash Feb. 11, 1947 FOREIGN PATENTS Country Date France Oct. 30, 1923 France Sept. 28, 1931 Great Britain Dec. 27, 1939 

